#include <iostream>
#include <cstring>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>

void Usage(std::string proc)
{
    std::cout << "\n\rUsage: " << proc << " serverip serverport\n"
              << std::endl;
}


int main(int argc,char* argv[])
{
    if(argc!=3)
    {
        Usage(argv[0]);
        exit(1);
    }

    std::string serverip =argv[1];
    uint16_t serverport = std::stoi(argv[2]);

    struct sockaddr_in server;
    memset(&server,0,sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port=htons(serverport);
    inet_pton(AF_INET,serverip.c_str(),&(server.sin_addr));

    while(true)
    {
        int cnt=5;
        int isreconnect = false;
        int sockfd=0;
        sockfd=socket(AF_INET,SOCK_STREAM,0);
        if(sockfd<0)
        {
            std::cerr<<"socket error"<<std::endl;
            return 1;
        }
        do
        {
            //tcp客户端bind时系统自行随机绑定不需要手动绑定
            int n = connect(sockfd,(struct sockaddr*)&server,sizeof(server));
            if(n<0)
            {
                isreconnect=true;
                cnt--;
                std::cerr<<"connect error....,reconnect: "<<cnt<<std::endl;
                sleep(2);
            }
            else 
            {
                break;
            }
        }while(cnt&&isreconnect);

        if(cnt==0)
        {
            std::cerr<<"user offline..."<<std::endl;
            break;
        }

        std::string message;
        std::cout<<"Please Enter# ";
        std::getline(std::cin,message);

        int n=write(sockfd,message.c_str(),message.size());
        if(n<0)
        {
            std::cerr<<"write error..."<<std::endl;
        }

        char inbuffer[4096];
        n =read(sockfd,inbuffer,sizeof(inbuffer));
        if(n>0)
        {
            inbuffer[n]=0;
            std::cout<<inbuffer<<std::endl;
        }
        else{
            //break;
        }
        close(sockfd);
    }

    return 0;
}